Describe with neat diagram the following experiments: (any two)
(1) To check the presence of carbon dioxide in exhaled air.
(2) To make an electromagnet from a given iron nall.
(3) To observe and study the images formed by placing an object at different distances in front of the convex lens..
Answers
Answer:
Limewater Test - To check for carbon dioxide in your breath
Lime Water Breath Experiment
Using lime water is a fun and easy way to test for the presence of carbon dioxide. The exhaled carbon dioxide is used to produce a precipitate of calcium carbonate with the lime water.
carbon dioxide + calcium hydroxide (limewater) → calcium carbonate + water
Procedure:
1. Add 50 ml of lime water to two 100 ml beakers.
2. Bubble room air through one beaker for one minute using a pipette and pipette pump. Observe and record the results.
3. With the other beaker, bubble exhaled air through the solution for 1 minute. Try to bubble the air through the same rate that you did with the first beaker. After 1 minute record your results
Answer:
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